accusative of measure

Space.—The accusative denotes the space or way over which an action is extended, and the measure of the space traversed.

ἄγειν (στρατιᾱ̀ν) στενᾱ̀ς ὁδούς to lead an army over narrow roads X. C. 1.6.43, ἐξελαύνει σταθμοὺς τρεῖς, παρασάγγᾱς εἴκοσι καὶ δύο he advances three stages, twenty- two parasangs X. A. 1.2.5, ἀπέχει ἡ Πλάταια τῶν Θηβῶν σταδίους ἑβδομήκοντα Plataea is seventy stades distant from Thebes T. 2.5.

a. This use is analogous to the cognate accusative after verbs of motion (ἐξόδους ἐξελθεῖν, πλεῖν θάλατταν).